Finding the Fourth Proportional to 31,113.60, 42,915.06 and 30,085.08

Step by Step Solution

1. Step 1: Write the proportion equation
   31,113.60 : 42,915.06 = 30,085.08 : x
2. Step 2: Convert to fraction form
   31,113.60/42,915.06 = 30,085.08/x
3. Step 3: Cross multiply
   31,113.60x = 42,915.06 × 30,085.08
4. Step 4: Simplify right side
   31,113.60x = 1,291,103,013.30
5. Step 5: Solve for x
   x = 1,291,103,013.30/31,113.60
6. Step 6: Final answer
   x = 41,496.42