Finding the Fourth Proportional to 142,819.42, 214,379.88 and 139,602.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,819.42 : 214,379.88 = 139,602.47 : x
2. Step 2: Convert to fraction form
   142,819.42/214,379.88 = 139,602.47/x
3. Step 3: Cross multiply
   142,819.42x = 214,379.88 × 139,602.47
4. Step 4: Simplify right side
   142,819.42x = 29,927,961,477.51
5. Step 5: Solve for x
   x = 29,927,961,477.51/142,819.42
6. Step 6: Final answer
   x = 209,551.07