Finding the Fourth Proportional to 72,031.98, 99,409.64 and 39,772.82

Step by Step Solution

1. Step 1: Write the proportion equation
   72,031.98 : 99,409.64 = 39,772.82 : x
2. Step 2: Convert to fraction form
   72,031.98/99,409.64 = 39,772.82/x
3. Step 3: Cross multiply
   72,031.98x = 99,409.64 × 39,772.82
4. Step 4: Simplify right side
   72,031.98x = 3,953,801,767.64
5. Step 5: Solve for x
   x = 3,953,801,767.64/72,031.98
6. Step 6: Final answer
   x = 54,889.53