Finding the Fourth Proportional to 290,046.79, 435,081.98 and 138,165.79

Step by Step Solution

1. Step 1: Write the proportion equation
   290,046.79 : 435,081.98 = 138,165.79 : x
2. Step 2: Convert to fraction form
   290,046.79/435,081.98 = 138,165.79/x
3. Step 3: Cross multiply
   290,046.79x = 435,081.98 × 138,165.79
4. Step 4: Simplify right side
   290,046.79x = 60,113,445,481.46
5. Step 5: Solve for x
   x = 60,113,445,481.46/290,046.79
6. Step 6: Final answer
   x = 207,254.30