Finding the Fourth Proportional to 171,097.30, 236,173.08 and 99,499.78

Step by Step Solution

1. Step 1: Write the proportion equation
   171,097.30 : 236,173.08 = 99,499.78 : x
2. Step 2: Convert to fraction form
   171,097.30/236,173.08 = 99,499.78/x
3. Step 3: Cross multiply
   171,097.30x = 236,173.08 × 99,499.78
4. Step 4: Simplify right side
   171,097.30x = 23,499,169,501.92
5. Step 5: Solve for x
   x = 23,499,169,501.92/171,097.30
6. Step 6: Final answer
   x = 137,343.89