Finding the Fourth Proportional to 91,308.25, 136,984.25 and 28,978.75

Step by Step Solution

1. Step 1: Write the proportion equation
   91,308.25 : 136,984.25 = 28,978.75 : x
2. Step 2: Convert to fraction form
   91,308.25/136,984.25 = 28,978.75/x
3. Step 3: Cross multiply
   91,308.25x = 136,984.25 × 28,978.75
4. Step 4: Simplify right side
   91,308.25x = 3,969,632,334.69
5. Step 5: Solve for x
   x = 3,969,632,334.69/91,308.25
6. Step 6: Final answer
   x = 43,475.07