Finding the Fourth Proportional to 109,509.32, 164,265.30 and 42,980.78

Step by Step Solution

1. Step 1: Write the proportion equation
   109,509.32 : 164,265.30 = 42,980.78 : x
2. Step 2: Convert to fraction form
   109,509.32/164,265.30 = 42,980.78/x
3. Step 3: Cross multiply
   109,509.32x = 164,265.30 × 42,980.78
4. Step 4: Simplify right side
   109,509.32x = 7,060,250,506.03
5. Step 5: Solve for x
   x = 7,060,250,506.03/109,509.32
6. Step 6: Final answer
   x = 64,471.69