Finding the Fourth Proportional to 1,557.89, 2,152.62 and 1,245.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.89 : 2,152.62 = 1,245.73 : x
2. Step 2: Convert to fraction form
   1,557.89/2,152.62 = 1,245.73/x
3. Step 3: Cross multiply
   1,557.89x = 2,152.62 × 1,245.73
4. Step 4: Simplify right side
   1,557.89x = 2,681,583.31
5. Step 5: Solve for x
   x = 2,681,583.31/1,557.89
6. Step 6: Final answer
   x = 1,721.29