Finding the Fourth Proportional to 12,820.61, 17,694.05 and 7,784.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.61 : 17,694.05 = 7,784.51 : x
2. Step 2: Convert to fraction form
   12,820.61/17,694.05 = 7,784.51/x
3. Step 3: Cross multiply
   12,820.61x = 17,694.05 × 7,784.51
4. Step 4: Simplify right side
   12,820.61x = 137,739,381.77
5. Step 5: Solve for x
   x = 137,739,381.77/12,820.61
6. Step 6: Final answer
   x = 10,743.59