Finding the Fourth Proportional to 46,261.60, 69,342.72 and 19,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   46,261.60 : 69,342.72 = 19,978.72 : x
2. Step 2: Convert to fraction form
   46,261.60/69,342.72 = 19,978.72/x
3. Step 3: Cross multiply
   46,261.60x = 69,342.72 × 19,978.72
4. Step 4: Simplify right side
   46,261.60x = 1,385,378,786.92
5. Step 5: Solve for x
   x = 1,385,378,786.92/46,261.60
6. Step 6: Final answer
   x = 29,946.62