Finding the Fourth Proportional to 120,359.31, 166,101.53 and 72,611.63

Step by Step Solution

1. Step 1: Write the proportion equation
   120,359.31 : 166,101.53 = 72,611.63 : x
2. Step 2: Convert to fraction form
   120,359.31/166,101.53 = 72,611.63/x
3. Step 3: Cross multiply
   120,359.31x = 166,101.53 × 72,611.63
4. Step 4: Simplify right side
   120,359.31x = 12,060,902,838.79
5. Step 5: Solve for x
   x = 12,060,902,838.79/120,359.31
6. Step 6: Final answer
   x = 100,207.48