Finding the Fourth Proportional to 391,903.39, 588,116.72 and 142,585.39

Step by Step Solution

1. Step 1: Write the proportion equation
   391,903.39 : 588,116.72 = 142,585.39 : x
2. Step 2: Convert to fraction form
   391,903.39/588,116.72 = 142,585.39/x
3. Step 3: Cross multiply
   391,903.39x = 588,116.72 × 142,585.39
4. Step 4: Simplify right side
   391,903.39x = 83,856,851,886.72
5. Step 5: Solve for x
   x = 83,856,851,886.72/391,903.39
6. Step 6: Final answer
   x = 213,973.28