Finding the Fourth Proportional to 90,251.94, 135,297.50 and 42,837.78

Step by Step Solution

1. Step 1: Write the proportion equation
   90,251.94 : 135,297.50 = 42,837.78 : x
2. Step 2: Convert to fraction form
   90,251.94/135,297.50 = 42,837.78/x
3. Step 3: Cross multiply
   90,251.94x = 135,297.50 × 42,837.78
4. Step 4: Simplify right side
   90,251.94x = 5,795,844,539.55
5. Step 5: Solve for x
   x = 5,795,844,539.55/90,251.94
6. Step 6: Final answer
   x = 64,218.50