Finding the Fourth Proportional to 4,953.60, 7,428.78 and 1,665.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,953.60 : 7,428.78 = 1,665.78 : x
2. Step 2: Convert to fraction form
   4,953.60/7,428.78 = 1,665.78/x
3. Step 3: Cross multiply
   4,953.60x = 7,428.78 × 1,665.78
4. Step 4: Simplify right side
   4,953.60x = 12,374,713.15
5. Step 5: Solve for x
   x = 12,374,713.15/4,953.60
6. Step 6: Final answer
   x = 2,498.13