Finding the Fourth Proportional to 142,588.48, 213,762.42 and 89,881.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,588.48 : 213,762.42 = 89,881.78 : x
2. Step 2: Convert to fraction form
   142,588.48/213,762.42 = 89,881.78/x
3. Step 3: Cross multiply
   142,588.48x = 213,762.42 × 89,881.78
4. Step 4: Simplify right side
   142,588.48x = 19,213,346,806.71
5. Step 5: Solve for x
   x = 19,213,346,806.71/142,588.48
6. Step 6: Final answer
   x = 134,746.84