Finding the Fourth Proportional to 120,789.72, 166,690.98 and 70,479

Step by Step Solution

1. Step 1: Write the proportion equation
   120,789.72 : 166,690.98 = 70,479 : x
2. Step 2: Convert to fraction form
   120,789.72/166,690.98 = 70,479/x
3. Step 3: Cross multiply
   120,789.72x = 166,690.98 × 70,479
4. Step 4: Simplify right side
   120,789.72x = 11,748,213,579.42
5. Step 5: Solve for x
   x = 11,748,213,579.42/120,789.72
6. Step 6: Final answer
   x = 97,261.70