Finding the Fourth Proportional to 40,090.84, 60,142.02 and 12,391

Step by Step Solution

1. Step 1: Write the proportion equation
   40,090.84 : 60,142.02 = 12,391 : x
2. Step 2: Convert to fraction form
   40,090.84/60,142.02 = 12,391/x
3. Step 3: Cross multiply
   40,090.84x = 60,142.02 × 12,391
4. Step 4: Simplify right side
   40,090.84x = 745,219,769.82
5. Step 5: Solve for x
   x = 745,219,769.82/40,090.84
6. Step 6: Final answer
   x = 18,588.28