Finding the Fourth Proportional to 1,139,239.01, 1,572,145.71 and 642,483.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,239.01 : 1,572,145.71 = 642,483.42 : x
2. Step 2: Convert to fraction form
   1,139,239.01/1,572,145.71 = 642,483.42/x
3. Step 3: Cross multiply
   1,139,239.01x = 1,572,145.71 × 642,483.42
4. Step 4: Simplify right side
   1,139,239.01x = 1,010,077,552,499.13
5. Step 5: Solve for x
   x = 1,010,077,552,499.13/1,139,239.01
6. Step 6: Final answer
   x = 886,624.79