Finding the Fourth Proportional to 120,358.31, 166,100.15 and 72,610.63

Step by Step Solution

1. Step 1: Write the proportion equation
   120,358.31 : 166,100.15 = 72,610.63 : x
2. Step 2: Convert to fraction form
   120,358.31/166,100.15 = 72,610.63/x
3. Step 3: Cross multiply
   120,358.31x = 166,100.15 × 72,610.63
4. Step 4: Simplify right side
   120,358.31x = 12,060,636,300.87
5. Step 5: Solve for x
   x = 12,060,636,300.87/120,358.31
6. Step 6: Final answer
   x = 100,206.10