Finding the Fourth Proportional to 39,085.69, 58,634.70 and 12,784.27

Step by Step Solution

1. Step 1: Write the proportion equation
   39,085.69 : 58,634.70 = 12,784.27 : x
2. Step 2: Convert to fraction form
   39,085.69/58,634.70 = 12,784.27/x
3. Step 3: Cross multiply
   39,085.69x = 58,634.70 × 12,784.27
4. Step 4: Simplify right side
   39,085.69x = 749,601,836.17
5. Step 5: Solve for x
   x = 749,601,836.17/39,085.69
6. Step 6: Final answer
   x = 19,178.42