Finding the Fourth Proportional to 128,829.72, 193,154.05 and 56,748.43

Step by Step Solution

1. Step 1: Write the proportion equation
   128,829.72 : 193,154.05 = 56,748.43 : x
2. Step 2: Convert to fraction form
   128,829.72/193,154.05 = 56,748.43/x
3. Step 3: Cross multiply
   128,829.72x = 193,154.05 × 56,748.43
4. Step 4: Simplify right side
   128,829.72x = 10,961,189,085.64
5. Step 5: Solve for x
   x = 10,961,189,085.64/128,829.72
6. Step 6: Final answer
   x = 85,082.77