Finding the Fourth Proportional to 129,670.10, 178,937.83 and 72,315.31

Step by Step Solution

1. Step 1: Write the proportion equation
   129,670.10 : 178,937.83 = 72,315.31 : x
2. Step 2: Convert to fraction form
   129,670.10/178,937.83 = 72,315.31/x
3. Step 3: Cross multiply
   129,670.10x = 178,937.83 × 72,315.31
4. Step 4: Simplify right side
   129,670.10x = 12,939,944,647.18
5. Step 5: Solve for x
   x = 12,939,944,647.18/129,670.10
6. Step 6: Final answer
   x = 99,791.28