Finding the Fourth Proportional to 2,088.56, 2,881.32 and 1,390.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,088.56 : 2,881.32 = 1,390.16 : x
2. Step 2: Convert to fraction form
   2,088.56/2,881.32 = 1,390.16/x
3. Step 3: Cross multiply
   2,088.56x = 2,881.32 × 1,390.16
4. Step 4: Simplify right side
   2,088.56x = 4,005,495.81
5. Step 5: Solve for x
   x = 4,005,495.81/2,088.56
6. Step 6: Final answer
   x = 1,917.83