Finding the Fourth Proportional to 1,338.80, 1,848.12 and 1,007.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.80 : 1,848.12 = 1,007.30 : x
2. Step 2: Convert to fraction form
   1,338.80/1,848.12 = 1,007.30/x
3. Step 3: Cross multiply
   1,338.80x = 1,848.12 × 1,007.30
4. Step 4: Simplify right side
   1,338.80x = 1,861,612.12
5. Step 5: Solve for x
   x = 1,861,612.12/1,338.80
6. Step 6: Final answer
   x = 1,390.51