Finding the Fourth Proportional to 53,530.79, 73,870.53 and 30,870.74

Step by Step Solution

1. Step 1: Write the proportion equation
   53,530.79 : 73,870.53 = 30,870.74 : x
2. Step 2: Convert to fraction form
   53,530.79/73,870.53 = 30,870.74/x
3. Step 3: Cross multiply
   53,530.79x = 73,870.53 × 30,870.74
4. Step 4: Simplify right side
   53,530.79x = 2,280,437,752.33
5. Step 5: Solve for x
   x = 2,280,437,752.33/53,530.79
6. Step 6: Final answer
   x = 42,600.49