Finding the Fourth Proportional to 1,178,906.31, 1,626,890.74 and 642,362.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178,906.31 : 1,626,890.74 = 642,362.31 : x
2. Step 2: Convert to fraction form
   1,178,906.31/1,626,890.74 = 642,362.31/x
3. Step 3: Cross multiply
   1,178,906.31x = 1,626,890.74 × 642,362.31
4. Step 4: Simplify right side
   1,178,906.31x = 1,045,053,292,258.10
5. Step 5: Solve for x
   x = 1,045,053,292,258.10/1,178,906.31
6. Step 6: Final answer
   x = 886,460.00