Finding the Fourth Proportional to 42,886.05, 64,307.13 and 17,919.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,886.05 : 64,307.13 = 17,919.28 : x
2. Step 2: Convert to fraction form
   42,886.05/64,307.13 = 17,919.28/x
3. Step 3: Cross multiply
   42,886.05x = 64,307.13 × 17,919.28
4. Step 4: Simplify right side
   42,886.05x = 1,152,337,468.47
5. Step 5: Solve for x
   x = 1,152,337,468.47/42,886.05
6. Step 6: Final answer
   x = 26,869.75