Finding the Fourth Proportional to 139,814.69, 209,753.17 and 51,068.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,814.69 : 209,753.17 = 51,068.05 : x
2. Step 2: Convert to fraction form
   139,814.69/209,753.17 = 51,068.05/x
3. Step 3: Cross multiply
   139,814.69x = 209,753.17 × 51,068.05
4. Step 4: Simplify right side
   139,814.69x = 10,711,685,373.22
5. Step 5: Solve for x
   x = 10,711,685,373.22/139,814.69
6. Step 6: Final answer
   x = 76,613.45