Finding the Fourth Proportional to 19,704.78, 29,487.83 and 12,312.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,704.78 : 29,487.83 = 12,312.72 : x
2. Step 2: Convert to fraction form
   19,704.78/29,487.83 = 12,312.72/x
3. Step 3: Cross multiply
   19,704.78x = 29,487.83 × 12,312.72
4. Step 4: Simplify right side
   19,704.78x = 363,075,332.63
5. Step 5: Solve for x
   x = 363,075,332.63/19,704.78
6. Step 6: Final answer
   x = 18,425.75