Finding the Fourth Proportional to 265,892.04, 398,915.82 and 78,908.40

Step by Step Solution

1. Step 1: Write the proportion equation
   265,892.04 : 398,915.82 = 78,908.40 : x
2. Step 2: Convert to fraction form
   265,892.04/398,915.82 = 78,908.40/x
3. Step 3: Cross multiply
   265,892.04x = 398,915.82 × 78,908.40
4. Step 4: Simplify right side
   265,892.04x = 31,477,809,090.89
5. Step 5: Solve for x
   x = 31,477,809,090.89/265,892.04
6. Step 6: Final answer
   x = 118,385.68