Finding the Fourth Proportional to 155,019.40, 213,980.74 and 91,353.12

Step by Step Solution

1. Step 1: Write the proportion equation
   155,019.40 : 213,980.74 = 91,353.12 : x
2. Step 2: Convert to fraction form
   155,019.40/213,980.74 = 91,353.12/x
3. Step 3: Cross multiply
   155,019.40x = 213,980.74 × 91,353.12
4. Step 4: Simplify right side
   155,019.40x = 19,547,808,218.91
5. Step 5: Solve for x
   x = 19,547,808,218.91/155,019.40
6. Step 6: Final answer
   x = 126,099.11