Finding the Fourth Proportional to 28,518.02, 42,779.54 and 7,457.99

Step by Step Solution

1. Step 1: Write the proportion equation
   28,518.02 : 42,779.54 = 7,457.99 : x
2. Step 2: Convert to fraction form
   28,518.02/42,779.54 = 7,457.99/x
3. Step 3: Cross multiply
   28,518.02x = 42,779.54 × 7,457.99
4. Step 4: Simplify right side
   28,518.02x = 319,049,144.32
5. Step 5: Solve for x
   x = 319,049,144.32/28,518.02
6. Step 6: Final answer
   x = 11,187.63