Finding the Fourth Proportional to 72,978.78, 109,468.17 and 56,363.06

Step by Step Solution

1. Step 1: Write the proportion equation
   72,978.78 : 109,468.17 = 56,363.06 : x
2. Step 2: Convert to fraction form
   72,978.78/109,468.17 = 56,363.06/x
3. Step 3: Cross multiply
   72,978.78x = 109,468.17 × 56,363.06
4. Step 4: Simplify right side
   72,978.78x = 6,169,960,486.46
5. Step 5: Solve for x
   x = 6,169,960,486.46/72,978.78
6. Step 6: Final answer
   x = 84,544.58