Finding the Fourth Proportional to 2,010.47, 3,015.72 and 623.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,010.47 : 3,015.72 = 623.78 : x
2. Step 2: Convert to fraction form
   2,010.47/3,015.72 = 623.78/x
3. Step 3: Cross multiply
   2,010.47x = 3,015.72 × 623.78
4. Step 4: Simplify right side
   2,010.47x = 1,881,145.82
5. Step 5: Solve for x
   x = 1,881,145.82/2,010.47
6. Step 6: Final answer
   x = 935.67