Finding the Fourth Proportional to 78,840.62, 118,276.50 and 28,921.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,840.62 : 118,276.50 = 28,921.18 : x
2. Step 2: Convert to fraction form
   78,840.62/118,276.50 = 28,921.18/x
3. Step 3: Cross multiply
   78,840.62x = 118,276.50 × 28,921.18
4. Step 4: Simplify right side
   78,840.62x = 3,420,695,354.89
5. Step 5: Solve for x
   x = 3,420,695,354.89/78,840.62
6. Step 6: Final answer
   x = 43,387.48