Finding the Fourth Proportional to 1,187,142.72, 1,779,926.76 and 388,144.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,187,142.72 : 1,779,926.76 = 388,144.32 : x
2. Step 2: Convert to fraction form
   1,187,142.72/1,779,926.76 = 388,144.32/x
3. Step 3: Cross multiply
   1,187,142.72x = 1,779,926.76 × 388,144.32
4. Step 4: Simplify right side
   1,187,142.72x = 690,868,461,910.00
5. Step 5: Solve for x
   x = 690,868,461,910.00/1,187,142.72
6. Step 6: Final answer
   x = 581,959.06