Finding the Fourth Proportional to 139,828,216.78, 209,742,988.56 and 42,783,769.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139,828,216.78 : 209,742,988.56 = 42,783,769.59 : x
2. Step 2: Convert to fraction form
   139,828,216.78/209,742,988.56 = 42,783,769.59/x
3. Step 3: Cross multiply
   139,828,216.78x = 209,742,988.56 × 42,783,769.59
4. Step 4: Simplify right side
   139,828,216.78x = 8,973,595,695,669,047
5. Step 5: Solve for x
   x = 8,973,595,695,669,047/139,828,216.78
6. Step 6: Final answer
   x = 64,175,857.36