Finding the Fourth Proportional to 153,900.96, 212,140.72 and 113,485.28

Step by Step Solution

1. Step 1: Write the proportion equation
   153,900.96 : 212,140.72 = 113,485.28 : x
2. Step 2: Convert to fraction form
   153,900.96/212,140.72 = 113,485.28/x
3. Step 3: Cross multiply
   153,900.96x = 212,140.72 × 113,485.28
4. Step 4: Simplify right side
   153,900.96x = 24,074,849,008.60
5. Step 5: Solve for x
   x = 24,074,849,008.60/153,900.96
6. Step 6: Final answer
   x = 156,430.79