Finding the Fourth Proportional to 426,733.32, 639,959.27 and 142,345.50

Step by Step Solution

1. Step 1: Write the proportion equation
   426,733.32 : 639,959.27 = 142,345.50 : x
2. Step 2: Convert to fraction form
   426,733.32/639,959.27 = 142,345.50/x
3. Step 3: Cross multiply
   426,733.32x = 639,959.27 × 142,345.50
4. Step 4: Simplify right side
   426,733.32x = 91,095,323,556.67
5. Step 5: Solve for x
   x = 91,095,323,556.67/426,733.32
6. Step 6: Final answer
   x = 213,471.32