Finding the Fourth Proportional to 168,100.07, 231,971.29 and 91,617.50

Step by Step Solution

1. Step 1: Write the proportion equation
   168,100.07 : 231,971.29 = 91,617.50 : x
2. Step 2: Convert to fraction form
   168,100.07/231,971.29 = 91,617.50/x
3. Step 3: Cross multiply
   168,100.07x = 231,971.29 × 91,617.50
4. Step 4: Simplify right side
   168,100.07x = 21,252,630,012.46
5. Step 5: Solve for x
   x = 21,252,630,012.46/168,100.07
6. Step 6: Final answer
   x = 126,428.45