Finding the Fourth Proportional to 1,145.10, 1,547.10 and 1,145.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.10 : 1,547.10 = 1,145.10 : x
2. Step 2: Convert to fraction form
   1,145.10/1,547.10 = 1,145.10/x
3. Step 3: Cross multiply
   1,145.10x = 1,547.10 × 1,145.10
4. Step 4: Simplify right side
   1,145.10x = 1,771,584.21
5. Step 5: Solve for x
   x = 1,771,584.21/1,145.10
6. Step 6: Final answer
   x = 1,547.10