Finding the Fourth Proportional to 85,888.72, 128,870.16 and 46,473.64

Step by Step Solution

1. Step 1: Write the proportion equation
   85,888.72 : 128,870.16 = 46,473.64 : x
2. Step 2: Convert to fraction form
   85,888.72/128,870.16 = 46,473.64/x
3. Step 3: Cross multiply
   85,888.72x = 128,870.16 × 46,473.64
4. Step 4: Simplify right side
   85,888.72x = 5,989,065,422.58
5. Step 5: Solve for x
   x = 5,989,065,422.58/85,888.72
6. Step 6: Final answer
   x = 69,730.52