Finding the Fourth Proportional to 67,931.57, 101,864.58 and 28,478.09

Step by Step Solution

1. Step 1: Write the proportion equation
   67,931.57 : 101,864.58 = 28,478.09 : x
2. Step 2: Convert to fraction form
   67,931.57/101,864.58 = 28,478.09/x
3. Step 3: Cross multiply
   67,931.57x = 101,864.58 × 28,478.09
4. Step 4: Simplify right side
   67,931.57x = 2,900,908,677.05
5. Step 5: Solve for x
   x = 2,900,908,677.05/67,931.57
6. Step 6: Final answer
   x = 42,703.40