Finding the Fourth Proportional to 1,911.30, 2,637.72 and 1,072.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.30 : 2,637.72 = 1,072.06 : x
2. Step 2: Convert to fraction form
   1,911.30/2,637.72 = 1,072.06/x
3. Step 3: Cross multiply
   1,911.30x = 2,637.72 × 1,072.06
4. Step 4: Simplify right side
   1,911.30x = 2,827,787.51
5. Step 5: Solve for x
   x = 2,827,787.51/1,911.30
6. Step 6: Final answer
   x = 1,479.51