Finding the Fourth Proportional to 56,143.98, 84,191.31 and 21,059.04

Step by Step Solution

1. Step 1: Write the proportion equation
   56,143.98 : 84,191.31 = 21,059.04 : x
2. Step 2: Convert to fraction form
   56,143.98/84,191.31 = 21,059.04/x
3. Step 3: Cross multiply
   56,143.98x = 84,191.31 × 21,059.04
4. Step 4: Simplify right side
   56,143.98x = 1,772,988,164.94
5. Step 5: Solve for x
   x = 1,772,988,164.94/56,143.98
6. Step 6: Final answer
   x = 31,579.31