Finding the Fourth Proportional to 34,302.51, 51,459.89 and 12,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   34,302.51 : 51,459.89 = 12,128.76 : x
2. Step 2: Convert to fraction form
   34,302.51/51,459.89 = 12,128.76/x
3. Step 3: Cross multiply
   34,302.51x = 51,459.89 × 12,128.76
4. Step 4: Simplify right side
   34,302.51x = 624,144,594.79
5. Step 5: Solve for x
   x = 624,144,594.79/34,302.51
6. Step 6: Final answer
   x = 18,195.30