Finding the Fourth Proportional to 61,021.88, 84,166.71 and 56,002.31

Step by Step Solution

1. Step 1: Write the proportion equation
   61,021.88 : 84,166.71 = 56,002.31 : x
2. Step 2: Convert to fraction form
   61,021.88/84,166.71 = 56,002.31/x
3. Step 3: Cross multiply
   61,021.88x = 84,166.71 × 56,002.31
4. Step 4: Simplify right side
   61,021.88x = 4,713,530,185.10
5. Step 5: Solve for x
   x = 4,713,530,185.10/61,021.88
6. Step 6: Final answer
   x = 77,243.28