Finding the Fourth Proportional to 85,380, 117,824.16 and 49,590.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,380 : 117,824.16 = 49,590.72 : x
2. Step 2: Convert to fraction form
   85,380/117,824.16 = 49,590.72/x
3. Step 3: Cross multiply
   85,380x = 117,824.16 × 49,590.72
4. Step 4: Simplify right side
   85,380x = 5,842,984,927.80
5. Step 5: Solve for x
   x = 5,842,984,927.80/85,380
6. Step 6: Final answer
   x = 68,435.05