Finding the Fourth Proportional to 65,111.20, 97,861.20 and 56,557.60

Step by Step Solution

1. Step 1: Write the proportion equation
   65,111.20 : 97,861.20 = 56,557.60 : x
2. Step 2: Convert to fraction form
   65,111.20/97,861.20 = 56,557.60/x
3. Step 3: Cross multiply
   65,111.20x = 97,861.20 × 56,557.60
4. Step 4: Simplify right side
   65,111.20x = 5,534,794,605.12
5. Step 5: Solve for x
   x = 5,534,794,605.12/65,111.20
6. Step 6: Final answer
   x = 85,005.26