Finding the Fourth Proportional to 85,845.72, 128,783.42 and 28,914.17

Step by Step Solution

1. Step 1: Write the proportion equation
   85,845.72 : 128,783.42 = 28,914.17 : x
2. Step 2: Convert to fraction form
   85,845.72/128,783.42 = 28,914.17/x
3. Step 3: Cross multiply
   85,845.72x = 128,783.42 × 28,914.17
4. Step 4: Simplify right side
   85,845.72x = 3,723,665,019.00
5. Step 5: Solve for x
   x = 3,723,665,019.00/85,845.72
6. Step 6: Final answer
   x = 43,376.24