Finding the Fourth Proportional to 1,510.89, 2,263.55 and 816.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.89 : 2,263.55 = 816.51 : x
2. Step 2: Convert to fraction form
   1,510.89/2,263.55 = 816.51/x
3. Step 3: Cross multiply
   1,510.89x = 2,263.55 × 816.51
4. Step 4: Simplify right side
   1,510.89x = 1,848,215.62
5. Step 5: Solve for x
   x = 1,848,215.62/1,510.89
6. Step 6: Final answer
   x = 1,223.27