Finding the Fourth Proportional to 90,978.63, 125,602.61 and 60,815.04

Step by Step Solution

1. Step 1: Write the proportion equation
   90,978.63 : 125,602.61 = 60,815.04 : x
2. Step 2: Convert to fraction form
   90,978.63/125,602.61 = 60,815.04/x
3. Step 3: Cross multiply
   90,978.63x = 125,602.61 × 60,815.04
4. Step 4: Simplify right side
   90,978.63x = 7,638,527,447.18
5. Step 5: Solve for x
   x = 7,638,527,447.18/90,978.63
6. Step 6: Final answer
   x = 83,959.58