Finding the Fourth Proportional to 85,768.12, 128,618.70 and 28,830.52

Step by Step Solution

1. Step 1: Write the proportion equation
   85,768.12 : 128,618.70 = 28,830.52 : x
2. Step 2: Convert to fraction form
   85,768.12/128,618.70 = 28,830.52/x
3. Step 3: Cross multiply
   85,768.12x = 128,618.70 × 28,830.52
4. Step 4: Simplify right side
   85,768.12x = 3,708,144,002.72
5. Step 5: Solve for x
   x = 3,708,144,002.72/85,768.12
6. Step 6: Final answer
   x = 43,234.53