Finding the Fourth Proportional to 397,066.05, 547,956.50 and 215,781.57

Step by Step Solution

1. Step 1: Write the proportion equation
   397,066.05 : 547,956.50 = 215,781.57 : x
2. Step 2: Convert to fraction form
   397,066.05/547,956.50 = 215,781.57/x
3. Step 3: Cross multiply
   397,066.05x = 547,956.50 × 215,781.57
4. Step 4: Simplify right side
   397,066.05x = 118,238,912,782.80
5. Step 5: Solve for x
   x = 118,238,912,782.80/397,066.05
6. Step 6: Final answer
   x = 297,781.47