Finding the Fourth Proportional to 61,185.76, 91,623.12 and 56,053.60

Step by Step Solution

1. Step 1: Write the proportion equation
   61,185.76 : 91,623.12 = 56,053.60 : x
2. Step 2: Convert to fraction form
   61,185.76/91,623.12 = 56,053.60/x
3. Step 3: Cross multiply
   61,185.76x = 91,623.12 × 56,053.60
4. Step 4: Simplify right side
   61,185.76x = 5,135,805,719.23
5. Step 5: Solve for x
   x = 5,135,805,719.23/61,185.76
6. Step 6: Final answer
   x = 83,937.92