Finding the Fourth Proportional to 31,213, 43,074.72 and 18,948.55

Step by Step Solution

1. Step 1: Write the proportion equation
   31,213 : 43,074.72 = 18,948.55 : x
2. Step 2: Convert to fraction form
   31,213/43,074.72 = 18,948.55/x
3. Step 3: Cross multiply
   31,213x = 43,074.72 × 18,948.55
4. Step 4: Simplify right side
   31,213x = 816,203,485.66
5. Step 5: Solve for x
   x = 816,203,485.66/31,213
6. Step 6: Final answer
   x = 26,149.47