Finding the Fourth Proportional to 498,998,648.78, 688,590,240.17 and 272,892,978.75

Step by Step Solution

1. Step 1: Write the proportion equation
   498,998,648.78 : 688,590,240.17 = 272,892,978.75 : x
2. Step 2: Convert to fraction form
   498,998,648.78/688,590,240.17 = 272,892,978.75/x
3. Step 3: Cross multiply
   498,998,648.78x = 688,590,240.17 × 272,892,978.75
4. Step 4: Simplify right side
   498,998,648.78x = 187,911,441,778,169,184
5. Step 5: Solve for x
   x = 187,911,441,778,169,184/498,998,648.78
6. Step 6: Final answer
   x = 376,577,055.34