Finding the Fourth Proportional to 111,672.55, 156,618.05 and 111,672.55

Step by Step Solution

1. Step 1: Write the proportion equation
   111,672.55 : 156,618.05 = 111,672.55 : x
2. Step 2: Convert to fraction form
   111,672.55/156,618.05 = 111,672.55/x
3. Step 3: Cross multiply
   111,672.55x = 156,618.05 × 111,672.55
4. Step 4: Simplify right side
   111,672.55x = 17,489,937,019.53
5. Step 5: Solve for x
   x = 17,489,937,019.53/111,672.55
6. Step 6: Final answer
   x = 156,618.05