Finding the Fourth Proportional to 66,003.50, 99,003.61 and 19,256.78

Step by Step Solution

1. Step 1: Write the proportion equation
   66,003.50 : 99,003.61 = 19,256.78 : x
2. Step 2: Convert to fraction form
   66,003.50/99,003.61 = 19,256.78/x
3. Step 3: Cross multiply
   66,003.50x = 99,003.61 × 19,256.78
4. Step 4: Simplify right side
   66,003.50x = 1,906,490,193.82
5. Step 5: Solve for x
   x = 1,906,490,193.82/66,003.50
6. Step 6: Final answer
   x = 28,884.69