Finding the Fourth Proportional to 128,830.72, 193,155.55 and 56,749.43

Step by Step Solution

1. Step 1: Write the proportion equation
   128,830.72 : 193,155.55 = 56,749.43 : x
2. Step 2: Convert to fraction form
   128,830.72/193,155.55 = 56,749.43/x
3. Step 3: Cross multiply
   128,830.72x = 193,155.55 × 56,749.43
4. Step 4: Simplify right side
   128,830.72x = 10,961,467,363.84
5. Step 5: Solve for x
   x = 10,961,467,363.84/128,830.72
6. Step 6: Final answer
   x = 85,084.27