Finding the Fourth Proportional to 238,914.42, 358,404.57 and 81,100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   238,914.42 : 358,404.57 = 81,100.50 : x
2. Step 2: Convert to fraction form
   238,914.42/358,404.57 = 81,100.50/x
3. Step 3: Cross multiply
   238,914.42x = 358,404.57 × 81,100.50
4. Step 4: Simplify right side
   238,914.42x = 29,066,789,829.29
5. Step 5: Solve for x
   x = 29,066,789,829.29/238,914.42
6. Step 6: Final answer
   x = 121,661.93