Finding the Fourth Proportional to 1,123,643.88, 1,550,248.74 and 639,865.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,643.88 : 1,550,248.74 = 639,865.98 : x
2. Step 2: Convert to fraction form
   1,123,643.88/1,550,248.74 = 639,865.98/x
3. Step 3: Cross multiply
   1,123,643.88x = 1,550,248.74 × 639,865.98
4. Step 4: Simplify right side
   1,123,643.88x = 991,951,429,263.87
5. Step 5: Solve for x
   x = 991,951,429,263.87/1,123,643.88
6. Step 6: Final answer
   x = 882,798.76