Finding the Fourth Proportional to 1,588.32, 2,191.50 and 1,215.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,588.32 : 2,191.50 = 1,215.72 : x
2. Step 2: Convert to fraction form
   1,588.32/2,191.50 = 1,215.72/x
3. Step 3: Cross multiply
   1,588.32x = 2,191.50 × 1,215.72
4. Step 4: Simplify right side
   1,588.32x = 2,664,250.38
5. Step 5: Solve for x
   x = 2,664,250.38/1,588.32
6. Step 6: Final answer
   x = 1,677.40