Finding the Fourth Proportional to 99,978.32, 149,967.77 and 28,906.75

Step by Step Solution

1. Step 1: Write the proportion equation
   99,978.32 : 149,967.77 = 28,906.75 : x
2. Step 2: Convert to fraction form
   99,978.32/149,967.77 = 28,906.75/x
3. Step 3: Cross multiply
   99,978.32x = 149,967.77 × 28,906.75
4. Step 4: Simplify right side
   99,978.32x = 4,335,080,143.21
5. Step 5: Solve for x
   x = 4,335,080,143.21/99,978.32
6. Step 6: Final answer
   x = 43,360.20