Finding the Fourth Proportional to 91,995.12, 137,978.91 and 28,800.54

Step by Step Solution

1. Step 1: Write the proportion equation
   91,995.12 : 137,978.91 = 28,800.54 : x
2. Step 2: Convert to fraction form
   91,995.12/137,978.91 = 28,800.54/x
3. Step 3: Cross multiply
   91,995.12x = 137,978.91 × 28,800.54
4. Step 4: Simplify right side
   91,995.12x = 3,973,867,116.61
5. Step 5: Solve for x
   x = 3,973,867,116.61/91,995.12
6. Step 6: Final answer
   x = 43,196.50