Finding the Fourth Proportional to 93,468.04, 128,985 and 57,643.72

Step by Step Solution

1. Step 1: Write the proportion equation
   93,468.04 : 128,985 = 57,643.72 : x
2. Step 2: Convert to fraction form
   93,468.04/128,985 = 57,643.72/x
3. Step 3: Cross multiply
   93,468.04x = 128,985 × 57,643.72
4. Step 4: Simplify right side
   93,468.04x = 7,435,175,224.20
5. Step 5: Solve for x
   x = 7,435,175,224.20/93,468.04
6. Step 6: Final answer
   x = 79,547.78