Finding the Fourth Proportional to 142,808.21, 213,949.58 and 89,490.26

Step by Step Solution

1. Step 1: Write the proportion equation
   142,808.21 : 213,949.58 = 89,490.26 : x
2. Step 2: Convert to fraction form
   142,808.21/213,949.58 = 89,490.26/x
3. Step 3: Cross multiply
   142,808.21x = 213,949.58 × 89,490.26
4. Step 4: Simplify right side
   142,808.21x = 19,146,402,023.89
5. Step 5: Solve for x
   x = 19,146,402,023.89/142,808.21
6. Step 6: Final answer
   x = 134,070.74