Finding the Fourth Proportional to 60,870.50, 91,305.78 and 19,317.50

Step by Step Solution

1. Step 1: Write the proportion equation
   60,870.50 : 91,305.78 = 19,317.50 : x
2. Step 2: Convert to fraction form
   60,870.50/91,305.78 = 19,317.50/x
3. Step 3: Cross multiply
   60,870.50x = 91,305.78 × 19,317.50
4. Step 4: Simplify right side
   60,870.50x = 1,763,799,405.15
5. Step 5: Solve for x
   x = 1,763,799,405.15/60,870.50
6. Step 6: Final answer
   x = 28,976.26