Finding the Fourth Proportional to 28,688.55, 42,839.65 and 23,434.05

Step by Step Solution

1. Step 1: Write the proportion equation
   28,688.55 : 42,839.65 = 23,434.05 : x
2. Step 2: Convert to fraction form
   28,688.55/42,839.65 = 23,434.05/x
3. Step 3: Cross multiply
   28,688.55x = 42,839.65 × 23,434.05
4. Step 4: Simplify right side
   28,688.55x = 1,003,906,529.38
5. Step 5: Solve for x
   x = 1,003,906,529.38/28,688.55
6. Step 6: Final answer
   x = 34,993.28