Finding the Fourth Proportional to 51,501.60, 72,309.60 and 51,501.60

Step by Step Solution

1. Step 1: Write the proportion equation
   51,501.60 : 72,309.60 = 51,501.60 : x
2. Step 2: Convert to fraction form
   51,501.60/72,309.60 = 51,501.60/x
3. Step 3: Cross multiply
   51,501.60x = 72,309.60 × 51,501.60
4. Step 4: Simplify right side
   51,501.60x = 3,724,060,095.36
5. Step 5: Solve for x
   x = 3,724,060,095.36/51,501.60
6. Step 6: Final answer
   x = 72,309.60