Finding the Fourth Proportional to 81,061.84, 111,810.72 and 70,433.20

Step by Step Solution

1. Step 1: Write the proportion equation
   81,061.84 : 111,810.72 = 70,433.20 : x
2. Step 2: Convert to fraction form
   81,061.84/111,810.72 = 70,433.20/x
3. Step 3: Cross multiply
   81,061.84x = 111,810.72 × 70,433.20
4. Step 4: Simplify right side
   81,061.84x = 7,875,186,803.90
5. Step 5: Solve for x
   x = 7,875,186,803.90/81,061.84
6. Step 6: Final answer
   x = 97,150.36