Finding the Fourth Proportional to 1,123,362.93, 1,549,862.32 and 639,585.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,362.93 : 1,549,862.32 = 639,585.78 : x
2. Step 2: Convert to fraction form
   1,123,362.93/1,549,862.32 = 639,585.78/x
3. Step 3: Cross multiply
   1,123,362.93x = 1,549,862.32 × 639,585.78
4. Step 4: Simplify right side
   1,123,362.93x = 991,269,900,829.81
5. Step 5: Solve for x
   x = 991,269,900,829.81/1,123,362.93
6. Step 6: Final answer
   x = 882,412.86