Finding the Fourth Proportional to 142,826.10, 214,757.55 and 139,715.70

Step by Step Solution

1. Step 1: Write the proportion equation
   142,826.10 : 214,757.55 = 139,715.70 : x
2. Step 2: Convert to fraction form
   142,826.10/214,757.55 = 139,715.70/x
3. Step 3: Cross multiply
   142,826.10x = 214,757.55 × 139,715.70
4. Step 4: Simplify right side
   142,826.10x = 30,005,001,428.54
5. Step 5: Solve for x
   x = 30,005,001,428.54/142,826.10
6. Step 6: Final answer
   x = 210,080.66