Finding the Fourth Proportional to 70,683,139.20, 105,875,409.60 and 70,683,139.20

Step by Step Solution

1. Step 1: Write the proportion equation
   70,683,139.20 : 105,875,409.60 = 70,683,139.20 : x
2. Step 2: Convert to fraction form
   70,683,139.20/105,875,409.60 = 70,683,139.20/x
3. Step 3: Cross multiply
   70,683,139.20x = 105,875,409.60 × 70,683,139.20
4. Step 4: Simplify right side
   70,683,139.20x = 7,483,606,314,613,816
5. Step 5: Solve for x
   x = 7,483,606,314,613,816/70,683,139.20
6. Step 6: Final answer
   x = 105,875,409.60