Finding the Fourth Proportional to 31,590.61, 43,528.59 and 21,501.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,590.61 : 43,528.59 = 21,501.25 : x
2. Step 2: Convert to fraction form
   31,590.61/43,528.59 = 21,501.25/x
3. Step 3: Cross multiply
   31,590.61x = 43,528.59 × 21,501.25
4. Step 4: Simplify right side
   31,590.61x = 935,918,986.92
5. Step 5: Solve for x
   x = 935,918,986.92/31,590.61
6. Step 6: Final answer
   x = 29,626.50