Finding the Fourth Proportional to 28,406.88, 42,622.56 and 11,779.02

Step by Step Solution

1. Step 1: Write the proportion equation
   28,406.88 : 42,622.56 = 11,779.02 : x
2. Step 2: Convert to fraction form
   28,406.88/42,622.56 = 11,779.02/x
3. Step 3: Cross multiply
   28,406.88x = 42,622.56 × 11,779.02
4. Step 4: Simplify right side
   28,406.88x = 502,051,986.69
5. Step 5: Solve for x
   x = 502,051,986.69/28,406.88
6. Step 6: Final answer
   x = 17,673.61