Finding the Fourth Proportional to 392,296.50, 588,532.23 and 142,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   392,296.50 : 588,532.23 = 142,978.50 : x
2. Step 2: Convert to fraction form
   392,296.50/588,532.23 = 142,978.50/x
3. Step 3: Cross multiply
   392,296.50x = 588,532.23 × 142,978.50
4. Step 4: Simplify right side
   392,296.50x = 84,147,455,447.06
5. Step 5: Solve for x
   x = 84,147,455,447.06/392,296.50
6. Step 6: Final answer
   x = 214,499.63