Finding the Fourth Proportional to 1,507.80, 2,079.72 and 1,383.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.80 : 2,079.72 = 1,383.88 : x
2. Step 2: Convert to fraction form
   1,507.80/2,079.72 = 1,383.88/x
3. Step 3: Cross multiply
   1,507.80x = 2,079.72 × 1,383.88
4. Step 4: Simplify right side
   1,507.80x = 2,878,082.91
5. Step 5: Solve for x
   x = 2,878,082.91/1,507.80
6. Step 6: Final answer
   x = 1,908.80