Finding the Fourth Proportional to 91,621.82, 137,439.42 and 28,433.90

Step by Step Solution

1. Step 1: Write the proportion equation
   91,621.82 : 137,439.42 = 28,433.90 : x
2. Step 2: Convert to fraction form
   91,621.82/137,439.42 = 28,433.90/x
3. Step 3: Cross multiply
   91,621.82x = 137,439.42 × 28,433.90
4. Step 4: Simplify right side
   91,621.82x = 3,907,938,724.34
5. Step 5: Solve for x
   x = 3,907,938,724.34/91,621.82
6. Step 6: Final answer
   x = 42,652.93