Finding the Fourth Proportional to 83,520.81, 125,288.52 and 21,191.31

Step by Step Solution

1. Step 1: Write the proportion equation
   83,520.81 : 125,288.52 = 21,191.31 : x
2. Step 2: Convert to fraction form
   83,520.81/125,288.52 = 21,191.31/x
3. Step 3: Cross multiply
   83,520.81x = 125,288.52 × 21,191.31
4. Step 4: Simplify right side
   83,520.81x = 2,655,027,866.76
5. Step 5: Solve for x
   x = 2,655,027,866.76/83,520.81
6. Step 6: Final answer
   x = 31,788.82