Finding the Fourth Proportional to 51,223.12, 70,692.56 and 31,085.12

Step by Step Solution

1. Step 1: Write the proportion equation
   51,223.12 : 70,692.56 = 31,085.12 : x
2. Step 2: Convert to fraction form
   51,223.12/70,692.56 = 31,085.12/x
3. Step 3: Cross multiply
   51,223.12x = 70,692.56 × 31,085.12
4. Step 4: Simplify right side
   51,223.12x = 2,197,486,710.71
5. Step 5: Solve for x
   x = 2,197,486,710.71/51,223.12
6. Step 6: Final answer
   x = 42,900.29