Finding the Fourth Proportional to 1,435.80, 2,148.72 and 1,172.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.80 : 2,148.72 = 1,172.76 : x
2. Step 2: Convert to fraction form
   1,435.80/2,148.72 = 1,172.76/x
3. Step 3: Cross multiply
   1,435.80x = 2,148.72 × 1,172.76
4. Step 4: Simplify right side
   1,435.80x = 2,519,932.87
5. Step 5: Solve for x
   x = 2,519,932.87/1,435.80
6. Step 6: Final answer
   x = 1,755.07