Finding the Fourth Proportional to 139,818.30, 209,579.76 and 100,354.02

Step by Step Solution

1. Step 1: Write the proportion equation
   139,818.30 : 209,579.76 = 100,354.02 : x
2. Step 2: Convert to fraction form
   139,818.30/209,579.76 = 100,354.02/x
3. Step 3: Cross multiply
   139,818.30x = 209,579.76 × 100,354.02
4. Step 4: Simplify right side
   139,818.30x = 21,032,171,426.64
5. Step 5: Solve for x
   x = 21,032,171,426.64/139,818.30
6. Step 6: Final answer
   x = 150,425.03