Finding the Fourth Proportional to 1,123,659.59, 1,550,270.37 and 639,881.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,659.59 : 1,550,270.37 = 639,881.69 : x
2. Step 2: Convert to fraction form
   1,123,659.59/1,550,270.37 = 639,881.69/x
3. Step 3: Cross multiply
   1,123,659.59x = 1,550,270.37 × 639,881.69
4. Step 4: Simplify right side
   1,123,659.59x = 991,989,624,312.53
5. Step 5: Solve for x
   x = 991,989,624,312.53/1,123,659.59
6. Step 6: Final answer
   x = 882,820.41