Finding the Fourth Proportional to 99,319.40, 137,061.31 and 58,485.29

Step by Step Solution

1. Step 1: Write the proportion equation
   99,319.40 : 137,061.31 = 58,485.29 : x
2. Step 2: Convert to fraction form
   99,319.40/137,061.31 = 58,485.29/x
3. Step 3: Cross multiply
   99,319.40x = 137,061.31 × 58,485.29
4. Step 4: Simplify right side
   99,319.40x = 8,016,070,659.57
5. Step 5: Solve for x
   x = 8,016,070,659.57/99,319.40
6. Step 6: Final answer
   x = 80,710.02