Finding the Fourth Proportional to 1,412.32, 1,931.71 and 1,389.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,412.32 : 1,931.71 = 1,389.64 : x
2. Step 2: Convert to fraction form
   1,412.32/1,931.71 = 1,389.64/x
3. Step 3: Cross multiply
   1,412.32x = 1,931.71 × 1,389.64
4. Step 4: Simplify right side
   1,412.32x = 2,684,381.48
5. Step 5: Solve for x
   x = 2,684,381.48/1,412.32
6. Step 6: Final answer
   x = 1,900.69