Finding the Fourth Proportional to 82,989.64, 124,420.65 and 42,965.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82,989.64 : 124,420.65 = 42,965.72 : x
2. Step 2: Convert to fraction form
   82,989.64/124,420.65 = 42,965.72/x
3. Step 3: Cross multiply
   82,989.64x = 124,420.65 × 42,965.72
4. Step 4: Simplify right side
   82,989.64x = 5,345,822,810.12
5. Step 5: Solve for x
   x = 5,345,822,810.12/82,989.64
6. Step 6: Final answer
   x = 64,415.54