Finding the Fourth Proportional to 1,445.42, 1,991.10 and 1,371.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.42 : 1,991.10 = 1,371.30 : x
2. Step 2: Convert to fraction form
   1,445.42/1,991.10 = 1,371.30/x
3. Step 3: Cross multiply
   1,445.42x = 1,991.10 × 1,371.30
4. Step 4: Simplify right side
   1,445.42x = 2,730,395.43
5. Step 5: Solve for x
   x = 2,730,395.43/1,445.42
6. Step 6: Final answer
   x = 1,889.00