Finding the Fourth Proportional to 1,445.89, 2,168.61 and 471.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.89 : 2,168.61 = 471.78 : x
2. Step 2: Convert to fraction form
   1,445.89/2,168.61 = 471.78/x
3. Step 3: Cross multiply
   1,445.89x = 2,168.61 × 471.78
4. Step 4: Simplify right side
   1,445.89x = 1,023,106.83
5. Step 5: Solve for x
   x = 1,023,106.83/1,445.89
6. Step 6: Final answer
   x = 707.60