Finding the Fourth Proportional to 37,020.76, 55,536.90 and 12,391

Step by Step Solution

1. Step 1: Write the proportion equation
   37,020.76 : 55,536.90 = 12,391 : x
2. Step 2: Convert to fraction form
   37,020.76/55,536.90 = 12,391/x
3. Step 3: Cross multiply
   37,020.76x = 55,536.90 × 12,391
4. Step 4: Simplify right side
   37,020.76x = 688,157,727.90
5. Step 5: Solve for x
   x = 688,157,727.90/37,020.76
6. Step 6: Final answer
   x = 18,588.43