Finding the Fourth Proportional to 71,231.60, 98,268.72 and 42,921.20

Step by Step Solution

1. Step 1: Write the proportion equation
   71,231.60 : 98,268.72 = 42,921.20 : x
2. Step 2: Convert to fraction form
   71,231.60/98,268.72 = 42,921.20/x
3. Step 3: Cross multiply
   71,231.60x = 98,268.72 × 42,921.20
4. Step 4: Simplify right side
   71,231.60x = 4,217,811,384.86
5. Step 5: Solve for x
   x = 4,217,811,384.86/71,231.60
6. Step 6: Final answer
   x = 59,212.64