Finding the Fourth Proportional to 1,123,273.77, 1,549,936.78 and 639,848.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123,273.77 : 1,549,936.78 = 639,848.35 : x
2. Step 2: Convert to fraction form
   1,123,273.77/1,549,936.78 = 639,848.35/x
3. Step 3: Cross multiply
   1,123,273.77x = 1,549,936.78 × 639,848.35
4. Step 4: Simplify right side
   1,123,273.77x = 991,724,491,287.31
5. Step 5: Solve for x
   x = 991,724,491,287.31/1,123,273.77
6. Step 6: Final answer
   x = 882,887.61