Finding the Fourth Proportional to 1,139,238.38, 1,572,144.85 and 642,482.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,238.38 : 1,572,144.85 = 642,482.80 : x
2. Step 2: Convert to fraction form
   1,139,238.38/1,572,144.85 = 642,482.80/x
3. Step 3: Cross multiply
   1,139,238.38x = 1,572,144.85 × 642,482.80
4. Step 4: Simplify right side
   1,139,238.38x = 1,010,076,025,233.58
5. Step 5: Solve for x
   x = 1,010,076,025,233.58/1,139,238.38
6. Step 6: Final answer
   x = 886,623.94