Finding the Fourth Proportional to 391,976.58, 587,962.71 and 142,658.58

Step by Step Solution

1. Step 1: Write the proportion equation
   391,976.58 : 587,962.71 = 142,658.58 : x
2. Step 2: Convert to fraction form
   391,976.58/587,962.71 = 142,658.58/x
3. Step 3: Cross multiply
   391,976.58x = 587,962.71 × 142,658.58
4. Step 4: Simplify right side
   391,976.58x = 83,877,925,301.55
5. Step 5: Solve for x
   x = 83,877,925,301.55/391,976.58
6. Step 6: Final answer
   x = 213,987.08