Finding the Fourth Proportional to 91,601.21, 137,410.50 and 28,422.02

Step by Step Solution

1. Step 1: Write the proportion equation
   91,601.21 : 137,410.50 = 28,422.02 : x
2. Step 2: Convert to fraction form
   91,601.21/137,410.50 = 28,422.02/x
3. Step 3: Cross multiply
   91,601.21x = 137,410.50 × 28,422.02
4. Step 4: Simplify right side
   91,601.21x = 3,905,483,979.21
5. Step 5: Solve for x
   x = 3,905,483,979.21/91,601.21
6. Step 6: Final answer
   x = 42,635.72