Finding the Fourth Proportional to 28,691.34, 42,981.31 and 22,779.15

Step by Step Solution

1. Step 1: Write the proportion equation
   28,691.34 : 42,981.31 = 22,779.15 : x
2. Step 2: Convert to fraction form
   28,691.34/42,981.31 = 22,779.15/x
3. Step 3: Cross multiply
   28,691.34x = 42,981.31 × 22,779.15
4. Step 4: Simplify right side
   28,691.34x = 979,077,707.69
5. Step 5: Solve for x
   x = 979,077,707.69/28,691.34
6. Step 6: Final answer
   x = 34,124.50