Finding the Fourth Proportional to 1,178,910.31, 1,626,896.25 and 642,366.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178,910.31 : 1,626,896.25 = 642,366.31 : x
2. Step 2: Convert to fraction form
   1,178,910.31/1,626,896.25 = 642,366.31/x
3. Step 3: Cross multiply
   1,178,910.31x = 1,626,896.25 × 642,366.31
4. Step 4: Simplify right side
   1,178,910.31x = 1,045,063,340,865.34
5. Step 5: Solve for x
   x = 1,045,063,340,865.34/1,178,910.31
6. Step 6: Final answer
   x = 886,465.52