Finding the Fourth Proportional to 1,575.56, 2,171.72 and 1,387.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.56 : 2,171.72 = 1,387.84 : x
2. Step 2: Convert to fraction form
   1,575.56/2,171.72 = 1,387.84/x
3. Step 3: Cross multiply
   1,575.56x = 2,171.72 × 1,387.84
4. Step 4: Simplify right side
   1,575.56x = 3,013,999.88
5. Step 5: Solve for x
   x = 3,013,999.88/1,575.56
6. Step 6: Final answer
   x = 1,912.97