Finding the Fourth Proportional to 28,499.38, 42,749.68 and 9,779.34

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.38 : 42,749.68 = 9,779.34 : x
2. Step 2: Convert to fraction form
   28,499.38/42,749.68 = 9,779.34/x
3. Step 3: Cross multiply
   28,499.38x = 42,749.68 × 9,779.34
4. Step 4: Simplify right side
   28,499.38x = 418,063,655.61
5. Step 5: Solve for x
   x = 418,063,655.61/28,499.38
6. Step 6: Final answer
   x = 14,669.22