Finding the Fourth Proportional to 139,047.69, 208,553.03 and 39,215.90

Step by Step Solution

1. Step 1: Write the proportion equation
   139,047.69 : 208,553.03 = 39,215.90 : x
2. Step 2: Convert to fraction form
   139,047.69/208,553.03 = 39,215.90/x
3. Step 3: Cross multiply
   139,047.69x = 208,553.03 × 39,215.90
4. Step 4: Simplify right side
   139,047.69x = 8,178,594,068.43
5. Step 5: Solve for x
   x = 8,178,594,068.43/139,047.69
6. Step 6: Final answer
   x = 58,818.63