Finding the Fourth Proportional to 1,575.95, 2,174.78 and 986.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.95 : 2,174.78 = 986.81 : x
2. Step 2: Convert to fraction form
   1,575.95/2,174.78 = 986.81/x
3. Step 3: Cross multiply
   1,575.95x = 2,174.78 × 986.81
4. Step 4: Simplify right side
   1,575.95x = 2,146,089.72
5. Step 5: Solve for x
   x = 2,146,089.72/1,575.95
6. Step 6: Final answer
   x = 1,361.78