Finding the Fourth Proportional to 1,412.48, 2,106.72 and 1,387.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,412.48 : 2,106.72 = 1,387.88 : x
2. Step 2: Convert to fraction form
   1,412.48/2,106.72 = 1,387.88/x
3. Step 3: Cross multiply
   1,412.48x = 2,106.72 × 1,387.88
4. Step 4: Simplify right side
   1,412.48x = 2,923,867.61
5. Step 5: Solve for x
   x = 2,923,867.61/1,412.48
6. Step 6: Final answer
   x = 2,070.02