Finding the Fourth Proportional to 143,658,756, 198,249,105.42 and 78,468,660

Step by Step Solution

1. Step 1: Write the proportion equation
   143,658,756 : 198,249,105.42 = 78,468,660 : x
2. Step 2: Convert to fraction form
   143,658,756/198,249,105.42 = 78,468,660/x
3. Step 3: Cross multiply
   143,658,756x = 198,249,105.42 × 78,468,660
4. Step 4: Simplify right side
   143,658,756x = 15,556,341,648,506,136
5. Step 5: Solve for x
   x = 15,556,341,648,506,136/143,658,756
6. Step 6: Final answer
   x = 108,286,762.89