Finding the Fourth Proportional to 87,986.72, 131,980.16 and 21,426.32

Step by Step Solution

1. Step 1: Write the proportion equation
   87,986.72 : 131,980.16 = 21,426.32 : x
2. Step 2: Convert to fraction form
   87,986.72/131,980.16 = 21,426.32/x
3. Step 3: Cross multiply
   87,986.72x = 131,980.16 × 21,426.32
4. Step 4: Simplify right side
   87,986.72x = 2,827,849,141.81
5. Step 5: Solve for x
   x = 2,827,849,141.81/87,986.72
6. Step 6: Final answer
   x = 32,139.50