Finding the Fourth Proportional to 72,301.60, 108,436.20 and 47,515.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,301.60 : 108,436.20 = 47,515.60 : x
2. Step 2: Convert to fraction form
   72,301.60/108,436.20 = 47,515.60/x
3. Step 3: Cross multiply
   72,301.60x = 108,436.20 × 47,515.60
4. Step 4: Simplify right side
   72,301.60x = 5,152,411,104.72
5. Step 5: Solve for x
   x = 5,152,411,104.72/72,301.60
6. Step 6: Final answer
   x = 71,262.75