Finding the Fourth Proportional to 60,678.26, 91,017.42 and 19,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   60,678.26 : 91,017.42 = 19,128.50 : x
2. Step 2: Convert to fraction form
   60,678.26/91,017.42 = 19,128.50/x
3. Step 3: Cross multiply
   60,678.26x = 91,017.42 × 19,128.50
4. Step 4: Simplify right side
   60,678.26x = 1,741,026,718.47
5. Step 5: Solve for x
   x = 1,741,026,718.47/60,678.26
6. Step 6: Final answer
   x = 28,692.76