Finding the Fourth Proportional to 1,139,498.26, 1,572,535.17 and 623,300.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,498.26 : 1,572,535.17 = 623,300.65 : x
2. Step 2: Convert to fraction form
   1,139,498.26/1,572,535.17 = 623,300.65/x
3. Step 3: Cross multiply
   1,139,498.26x = 1,572,535.17 × 623,300.65
4. Step 4: Simplify right side
   1,139,498.26x = 980,162,193,608.86
5. Step 5: Solve for x
   x = 980,162,193,608.86/1,139,498.26
6. Step 6: Final answer
   x = 860,169.98