Finding the Fourth Proportional to 1,386.32, 1,914.54 and 1,055.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.32 : 1,914.54 = 1,055.53 : x
2. Step 2: Convert to fraction form
   1,386.32/1,914.54 = 1,055.53/x
3. Step 3: Cross multiply
   1,386.32x = 1,914.54 × 1,055.53
4. Step 4: Simplify right side
   1,386.32x = 2,020,852.84
5. Step 5: Solve for x
   x = 2,020,852.84/1,386.32
6. Step 6: Final answer
   x = 1,457.72