Finding the Fourth Proportional to 143,005.99, 197,347.72 and 78,476.30

Step by Step Solution

1. Step 1: Write the proportion equation
   143,005.99 : 197,347.72 = 78,476.30 : x
2. Step 2: Convert to fraction form
   143,005.99/197,347.72 = 78,476.30/x
3. Step 3: Cross multiply
   143,005.99x = 197,347.72 × 78,476.30
4. Step 4: Simplify right side
   143,005.99x = 15,487,117,892.30
5. Step 5: Solve for x
   x = 15,487,117,892.30/143,005.99
6. Step 6: Final answer
   x = 108,296.99