Finding the Fourth Proportional to 1,402.68, 1,934.63 and 1,072.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.68 : 1,934.63 = 1,072.20 : x
2. Step 2: Convert to fraction form
   1,402.68/1,934.63 = 1,072.20/x
3. Step 3: Cross multiply
   1,402.68x = 1,934.63 × 1,072.20
4. Step 4: Simplify right side
   1,402.68x = 2,074,322.23
5. Step 5: Solve for x
   x = 2,074,322.23/1,402.68
6. Step 6: Final answer
   x = 1,478.82