Finding the Fourth Proportional to 354,978.98, 532,725.39 and 138,869.59

Step by Step Solution

1. Step 1: Write the proportion equation
   354,978.98 : 532,725.39 = 138,869.59 : x
2. Step 2: Convert to fraction form
   354,978.98/532,725.39 = 138,869.59/x
3. Step 3: Cross multiply
   354,978.98x = 532,725.39 × 138,869.59
4. Step 4: Simplify right side
   354,978.98x = 73,979,356,491.89
5. Step 5: Solve for x
   x = 73,979,356,491.89/354,978.98
6. Step 6: Final answer
   x = 208,404.89