Finding the Fourth Proportional to 7,619.98, 10,515.75 and 5,385.81

Step by Step Solution

1. Step 1: Write the proportion equation
   7,619.98 : 10,515.75 = 5,385.81 : x
2. Step 2: Convert to fraction form
   7,619.98/10,515.75 = 5,385.81/x
3. Step 3: Cross multiply
   7,619.98x = 10,515.75 × 5,385.81
4. Step 4: Simplify right side
   7,619.98x = 56,635,831.51
5. Step 5: Solve for x
   x = 56,635,831.51/7,619.98
6. Step 6: Final answer
   x = 7,432.54