Finding the Fourth Proportional to 120,507.64, 166,300.48 and 72,772.72

Step by Step Solution

1. Step 1: Write the proportion equation
   120,507.64 : 166,300.48 = 72,772.72 : x
2. Step 2: Convert to fraction form
   120,507.64/166,300.48 = 72,772.72/x
3. Step 3: Cross multiply
   120,507.64x = 166,300.48 × 72,772.72
4. Step 4: Simplify right side
   120,507.64x = 12,102,138,266.91
5. Step 5: Solve for x
   x = 12,102,138,266.91/120,507.64
6. Step 6: Final answer
   x = 100,426.32