Finding the Fourth Proportional to 521,789, 782,672.34 and 142,709.72

Step by Step Solution

1. Step 1: Write the proportion equation
   521,789 : 782,672.34 = 142,709.72 : x
2. Step 2: Convert to fraction form
   521,789/782,672.34 = 142,709.72/x
3. Step 3: Cross multiply
   521,789x = 782,672.34 × 142,709.72
4. Step 4: Simplify right side
   521,789x = 111,694,950,493.15
5. Step 5: Solve for x
   x = 111,694,950,493.15/521,789
6. Step 6: Final answer
   x = 214,061.53