Finding the Fourth Proportional to 1,376.34, 1,897.53 and 1,139.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.34 : 1,897.53 = 1,139.42 : x
2. Step 2: Convert to fraction form
   1,376.34/1,897.53 = 1,139.42/x
3. Step 3: Cross multiply
   1,376.34x = 1,897.53 × 1,139.42
4. Step 4: Simplify right side
   1,376.34x = 2,162,074.14
5. Step 5: Solve for x
   x = 2,162,074.14/1,376.34
6. Step 6: Final answer
   x = 1,570.89