Finding the Fourth Proportional to 91,978.22, 137,915.28 and 31,979.09

Step by Step Solution

1. Step 1: Write the proportion equation
   91,978.22 : 137,915.28 = 31,979.09 : x
2. Step 2: Convert to fraction form
   91,978.22/137,915.28 = 31,979.09/x
3. Step 3: Cross multiply
   91,978.22x = 137,915.28 × 31,979.09
4. Step 4: Simplify right side
   91,978.22x = 4,410,404,461.92
5. Step 5: Solve for x
   x = 4,410,404,461.92/91,978.22
6. Step 6: Final answer
   x = 47,950.53