Finding the Fourth Proportional to 257,258.72, 385,925.43 and 79,780.04

Step by Step Solution

1. Step 1: Write the proportion equation
   257,258.72 : 385,925.43 = 79,780.04 : x
2. Step 2: Convert to fraction form
   257,258.72/385,925.43 = 79,780.04/x
3. Step 3: Cross multiply
   257,258.72x = 385,925.43 × 79,780.04
4. Step 4: Simplify right side
   257,258.72x = 30,789,146,242.42
5. Step 5: Solve for x
   x = 30,789,146,242.42/257,258.72
6. Step 6: Final answer
   x = 119,681.64