Finding the Fourth Proportional to 1,178,852.50, 1,626,816.54 and 642,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178,852.50 : 1,626,816.54 = 642,308.50 : x
2. Step 2: Convert to fraction form
   1,178,852.50/1,626,816.54 = 642,308.50/x
3. Step 3: Cross multiply
   1,178,852.50x = 1,626,816.54 × 642,308.50
4. Step 4: Simplify right side
   1,178,852.50x = 1,044,918,091,582.59
5. Step 5: Solve for x
   x = 1,044,918,091,582.59/1,178,852.50
6. Step 6: Final answer
   x = 886,385.78