Finding the Fourth Proportional to 28,499.50, 42,750.12 and 9,779.27

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.50 : 42,750.12 = 9,779.27 : x
2. Step 2: Convert to fraction form
   28,499.50/42,750.12 = 9,779.27/x
3. Step 3: Cross multiply
   28,499.50x = 42,750.12 × 9,779.27
4. Step 4: Simplify right side
   28,499.50x = 418,064,966.01
5. Step 5: Solve for x
   x = 418,064,966.01/28,499.50
6. Step 6: Final answer
   x = 14,669.20