Finding the Fourth Proportional to 1,123,421.58, 1,550,148.37 and 639,925.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,421.58 : 1,550,148.37 = 639,925.29 : x
2. Step 2: Convert to fraction form
   1,123,421.58/1,550,148.37 = 639,925.29/x
3. Step 3: Cross multiply
   1,123,421.58x = 1,550,148.37 × 639,925.29
4. Step 4: Simplify right side
   1,123,421.58x = 991,979,143,615.46
5. Step 5: Solve for x
   x = 991,979,143,615.46/1,123,421.58
6. Step 6: Final answer
   x = 882,998.12