Finding the Fourth Proportional to 1,389.93, 2,073.11 and 1,172.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.93 : 2,073.11 = 1,172.00 : x
2. Step 2: Convert to fraction form
   1,389.93/2,073.11 = 1,172.00/x
3. Step 3: Cross multiply
   1,389.93x = 2,073.11 × 1,172.00
4. Step 4: Simplify right side
   1,389.93x = 2,429,677.48
5. Step 5: Solve for x
   x = 2,429,677.48/1,389.93
6. Step 6: Final answer
   x = 1,748.06