Finding the Fourth Proportional to 31,069.10, 42,861.71 and 20,993.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,069.10 : 42,861.71 = 20,993.86 : x
2. Step 2: Convert to fraction form
   31,069.10/42,861.71 = 20,993.86/x
3. Step 3: Cross multiply
   31,069.10x = 42,861.71 × 20,993.86
4. Step 4: Simplify right side
   31,069.10x = 899,832,687.71
5. Step 5: Solve for x
   x = 899,832,687.71/31,069.10
6. Step 6: Final answer
   x = 28,962.31