Finding the Fourth Proportional to 1,931.51, 2,665.62 and 1,861.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.51 : 2,665.62 = 1,861.81 : x
2. Step 2: Convert to fraction form
   1,931.51/2,665.62 = 1,861.81/x
3. Step 3: Cross multiply
   1,931.51x = 2,665.62 × 1,861.81
4. Step 4: Simplify right side
   1,931.51x = 4,962,871.31
5. Step 5: Solve for x
   x = 4,962,871.31/1,931.51
6. Step 6: Final answer
   x = 2,569.42