Finding the Fourth Proportional to 1,123,617.88, 1,550,212.86 and 639,839.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,617.88 : 1,550,212.86 = 639,839.98 : x
2. Step 2: Convert to fraction form
   1,123,617.88/1,550,212.86 = 639,839.98/x
3. Step 3: Cross multiply
   1,123,617.88x = 1,550,212.86 × 639,839.98
4. Step 4: Simplify right side
   1,123,617.88x = 991,888,165,338.14
5. Step 5: Solve for x
   x = 991,888,165,338.14/1,123,617.88
6. Step 6: Final answer
   x = 882,762.89