Finding the Fourth Proportional to 1,388.93, 2,071.62 and 1,171.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.93 : 2,071.62 = 1,171.00 : x
2. Step 2: Convert to fraction form
   1,388.93/2,071.62 = 1,171.00/x
3. Step 3: Cross multiply
   1,388.93x = 2,071.62 × 1,171.00
4. Step 4: Simplify right side
   1,388.93x = 2,425,850.81
5. Step 5: Solve for x
   x = 2,425,850.81/1,388.93
6. Step 6: Final answer
   x = 1,746.56