Finding the Fourth Proportional to 31,655.80, 43,702.50 and 21,061

Step by Step Solution

1. Step 1: Write the proportion equation
   31,655.80 : 43,702.50 = 21,061 : x
2. Step 2: Convert to fraction form
   31,655.80/43,702.50 = 21,061/x
3. Step 3: Cross multiply
   31,655.80x = 43,702.50 × 21,061
4. Step 4: Simplify right side
   31,655.80x = 920,418,352.50
5. Step 5: Solve for x
   x = 920,418,352.50/31,655.80
6. Step 6: Final answer
   x = 29,075.82