Finding the Fourth Proportional to 143,061.60, 197,421 and 78,530.79

Step by Step Solution

1. Step 1: Write the proportion equation
   143,061.60 : 197,421 = 78,530.79 : x
2. Step 2: Convert to fraction form
   143,061.60/197,421 = 78,530.79/x
3. Step 3: Cross multiply
   143,061.60x = 197,421 × 78,530.79
4. Step 4: Simplify right side
   143,061.60x = 15,503,627,092.59
5. Step 5: Solve for x
   x = 15,503,627,092.59/143,061.60
6. Step 6: Final answer
   x = 108,370.29