Finding the Fourth Proportional to 111,199.30, 153,302.50 and 70,343.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111,199.30 : 153,302.50 = 70,343.10 : x
2. Step 2: Convert to fraction form
   111,199.30/153,302.50 = 70,343.10/x
3. Step 3: Cross multiply
   111,199.30x = 153,302.50 × 70,343.10
4. Step 4: Simplify right side
   111,199.30x = 10,783,773,087.75
5. Step 5: Solve for x
   x = 10,783,773,087.75/111,199.30
6. Step 6: Final answer
   x = 96,976.99