Finding the Fourth Proportional to 139,688.16, 209,486.88 and 60,779.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,688.16 : 209,486.88 = 60,779.04 : x
2. Step 2: Convert to fraction form
   139,688.16/209,486.88 = 60,779.04/x
3. Step 3: Cross multiply
   139,688.16x = 209,486.88 × 60,779.04
4. Step 4: Simplify right side
   139,688.16x = 12,732,411,459.00
5. Step 5: Solve for x
   x = 12,732,411,459.00/139,688.16
6. Step 6: Final answer
   x = 91,148.82