Finding the Fourth Proportional to 98,863, 136,430.94 and 56,420.62

Step by Step Solution

1. Step 1: Write the proportion equation
   98,863 : 136,430.94 = 56,420.62 : x
2. Step 2: Convert to fraction form
   98,863/136,430.94 = 56,420.62/x
3. Step 3: Cross multiply
   98,863x = 136,430.94 × 56,420.62
4. Step 4: Simplify right side
   98,863x = 7,697,518,221.98
5. Step 5: Solve for x
   x = 7,697,518,221.98/98,863
6. Step 6: Final answer
   x = 77,860.46