Finding the Fourth Proportional to 426,735.32, 639,962.27 and 142,347.50

Step by Step Solution

1. Step 1: Write the proportion equation
   426,735.32 : 639,962.27 = 142,347.50 : x
2. Step 2: Convert to fraction form
   426,735.32/639,962.27 = 142,347.50/x
3. Step 3: Cross multiply
   426,735.32x = 639,962.27 × 142,347.50
4. Step 4: Simplify right side
   426,735.32x = 91,097,029,228.83
5. Step 5: Solve for x
   x = 91,097,029,228.83/426,735.32
6. Step 6: Final answer
   x = 213,474.31