Finding the Fourth Proportional to 39,492.72, 54,499.82 and 21,587.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,492.72 : 54,499.82 = 21,587.72 : x
2. Step 2: Convert to fraction form
   39,492.72/54,499.82 = 21,587.72/x
3. Step 3: Cross multiply
   39,492.72x = 54,499.82 × 21,587.72
4. Step 4: Simplify right side
   39,492.72x = 1,176,526,854.21
5. Step 5: Solve for x
   x = 1,176,526,854.21/39,492.72
6. Step 6: Final answer
   x = 29,790.98