Finding the Fourth Proportional to 66,421.47, 99,191.95 and 58,373.31

Step by Step Solution

1. Step 1: Write the proportion equation
   66,421.47 : 99,191.95 = 58,373.31 : x
2. Step 2: Convert to fraction form
   66,421.47/99,191.95 = 58,373.31/x
3. Step 3: Cross multiply
   66,421.47x = 99,191.95 × 58,373.31
4. Step 4: Simplify right side
   66,421.47x = 5,790,162,672.89
5. Step 5: Solve for x
   x = 5,790,162,672.89/66,421.47
6. Step 6: Final answer
   x = 87,173.05